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Good question about the shampoo – I’m guessing 10:1? 20:1? I’d try more dilute first, and you can always add a few drops more of shampoo if you need it. And
you only use a drop or two of the final product. The idea is to create a very thin dry layer of the stuff on the mirror so that if water droplets condense, they do so in a transparent film rather than big drops. The commercially available anti-foggers work
pretty much the same way.